𝗛𝗼𝘄 𝗘𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲 𝗮𝗿𝗲 𝗙𝗹𝘂 𝗦𝗵𝗼𝘁𝘀?
👉Flu shots have varying levels of effectiveness depending on factors like the specific strain of the virus and individual circumstances such as age and overall health. Its effectiveness can change from year to year due to the ever-changing nature of the influenza virus.